<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" :closable="false" center show-icon>
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 用form表单包裹起来 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
      label-width="100px" label-position="top">
        <!-- tab栏区域 -->
        <el-tabs v-model="activeIndex" :tab-position="'left'"
        :before-leave="beforeTableLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                expand-trigger="hover"
                :props="cateProps"
                @change="handleChange"></el-cascader>
              </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" :key="i" border
                v-for="(cb,i) in item.attr_vals"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action="后台API地址" 表示图片要上传到的后台API地址 -->
            <!-- list-type,文件的呈现方式 -->
            <el-upload
            :action="uploadURL" :on-preview="handlePreview"
            :on-remove="handleRemove" list-type="picture"
            :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
    title="图片预览"
    :visible.sync="previewVisible"
    width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    // 方便测试
    var num = Math.floor(Math.random() * 999)
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '默认商品' + num,
        goods_price: 999 + num,
        goods_weight: 100 + num,
        goods_number: 999 + num,
        // 商品所属的分类数组
        goods_cat: [1, 3, 6],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '没什么可说的,测试',
        attrs: []
      },
      // 添加商品的表单校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableDate: [],
      // 静态属性列表数据
      onlyTableDate: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片
      previewPath: '',
      // 图片预览对话框
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类列表失败')

      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择框选中项变化会触发这个函数
    handleChange () {
      // 不是三级分类清空this.addForm.goods_cat数组
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
    },
    // 只要触发了beforeTableLeave,就说明发生tab切换了
    beforeTableLeave (activeName, oldActiveName) {
      // console.log('即将离开的:' + oldActiveName, '即将进入的:' + activeName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // tab被选中的时候触发的事件
    async tabClicked () {
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        // console.log('商品参数面板')
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
        // console.log(res.data)

        // 判断输出之前,将attr_vals数据做一个分割数组
        res.data.forEach(item => {
        // 将item.attr_vals 字符串分割成数组在重新赋值给  item.attr_vals
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
        this.manyTableDate = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败')
        // console.log(res.data)
        this.onlyTableDate = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      // console.log(file)
      this.previewPath = file.response.data.url
      // 显示图片
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice 方法，把图片信息对象， 从pics 数组中移除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },
    // 添加商品
    add () {
      // console.log(this.addForm)
      // 表单预验证
      this.$refs.addFormRef.validate(async valid => {
      //   console.log(valid)
        // valid为false,直接出去
        if (!valid) return this.$message.error('请填写必要的表单项')
        // 执行添加业务逻辑
        // 级联选择器只允许绑定数组,用v-model实时绑定的
        // lodash  cloneDeep(obj) 深拷贝这个数组,再把新数组转字符串
        // this.addForm.goods_cat = this.addForm.goods_cat.join(',')  //  冲突

        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        // 发起请求添加商品
        // 商品的名称，必须是唯一 的
        const { data: res } = await this.$http.post('goods', form)
        // console.log(res)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        // 跳转到商品列表页
        this.$router.push('/goods')
      })
    }
  },
  // 计算属性
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) return this.addForm.goods_cat[2]
      return null
    }
  }
}
</script>

<style scoped lang="less">
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>
